Chain-stitch sewing-machine.



No. 645,833. Patented Mar. 20, 19.00.

v A. RONTKE; CHAIN STITCH SEWING MACHINE.

(Application filed Apr. 13, 1897.)

2 sheetsesheet I (No Model.)

No. 645,833.' Patented Mar. 20, moo.

A RDNTKE r CHAIN STITCH SEWING MACHINE.

(Application filed Apr. 13, 1897 i 2 Sheets8heet 2.

(No Model.)

man STATES ATENT rrrcn.

ALBERT RONTKE, OF ELIZABETH, NEW JERSEY, ASSIGNORTO TIIE SINGER MANUFACTURING COMPANY, OF NEW JERSEY.

CHAIN-STITCH SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 645,833, dated March 20, 1900.

Application filed April 13, 1897. Serial No. 632,003. (No model.)

To all whom; it may concern.-

Be it known that I, ALBERT RONTKE, a citi z'en of the United States,residing at Elizabeth,

in the county of Union and State of New Jer- I sey,have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings. This invention has for its object to provide a higlrspeed post sewing-machine of simple construction and adapted to be employed either as a single-needle, two-needle, or multiple sewing-machine in that oscillating or rocking loop-taking device or devices are employed and are carried or operated by ahorizontal rock-shaft arranged transverse to the direction of the feed of the work and located in the upper part of the work-supporting post, so that any desired number of these rocking loop-taking devices to cooperate with any desired number of needles may be employed. In carrying the invention into effect double chain-stitch loopers carried by the horizontal rocker or rock-shaft, which is arranged transverse to the direction of the feed of the work, so that said loopers oscillate in the line of the feed of the work, are preferably employed, although other equivalent forms of similarlyarranged oscillating loop taking devices might be used. In the accompanying drawings, Figure 1 is a side elevation, with the framework partly broken away, of a sewing-machine embodying the invention. Fig.2 is a front end view of the lower part of the same, with the framework in section; and Fig. 3 is asectional elevation looking at the rear side of the post. The framework of the machine comprises the standard A, the overhanging arm A, and the bed-plate A the last named being provided at its forward end with the elevated hollow work-supporting post A B is the rotating driving-shaft, provided near its rear end with the crank Z) and having at its forward end the usual crank-andpitman connection with the needle-bar C, carrying one or more eye-pointed needles 0. The crank b is connected by a pitman d with an arm cl at the rear end of a rock-shaft D, journaled beneath the bed-plate A and having at its forward end an arm (7 E is a horizontal rocker or rock-shaft journaled in the upper part of the post A and provided with an arm 6, connected by a pitman 6 to the arm d of the operating rockshaft D, said rocker or rock-shaft carrying within said post one or more oscillating looptaking devices. These loop-taking devices,

'as herein shown, are double chain-stitchloopthese double chain-stitch loopers are pre-' ferred.

F denotes a vertical feed-lever within the post A and pivoted on a pin or screwf, supported by a web a,integral with said post, said lever carrying at its upper end the feeddogf' and being jointed at its lower end to one end' of a bar f ,the opposite end of which is pivotally connected to an arm or arms 9 at the forward end of a feed-operating rockshaft G, having at its rear end an arm g, to which is jointed the lower end of a feed-op crating lever H, having at its upper end a yoke 'hto embrace a cam on the rotatingdriving-shaft B and connected by a link h to the feed-regulating lever h This toggle operating and regulating mechanism for the feedoperating rock-shaft G is that which has long been in use in several kinds ofthe well-known Singer machines and need not therefore be herein more fully described. The vertical movements of the feed-lever, F are im parted thereto bya cam or eccentric d on the rock-shaft D and working in a yoke f with which the'bar f is provided, while the vibrating movements of said feed-lever to cause the feed-dogf to be moved back and forth horizontally to feed the work and return are imparted thereto from the rock-shaft G, these vibrating or feeding movements being varied or regulated by varying the rocking movements of the said shaft by means of the le= ver 72 In connection with the double chain-stitch loopers herein shown I prefer to employ a take-up mechanism for the looper-threads located at or near the base of the post A and consisting of a lever I, slotted at one end to embrace a roller-stud 9 carried by an arm g fast on the feed-operating rock-shaft G, and forked at its other end to form two threadeye arms 1' 11, between which works an opposing take-up arm (1 fixed to the looper-operating rock-shaft D. The lever I is pivoted to a lug or part of the bed-plate A and as it is vibrated from the feed-operating rock-shaft its vibrating movements will vary according to the feeding movements of said shaft, so that the take-up movements of said lever will be longer or shorter as the feed or length of stitch is longer or shorter.

I am aware that two-needle post sewingmachines have heretofore been constructed; but in these machines, in which the loop-taking devices were located in the upper parts of the work-supporting posts, rotating lock-' stitch or other forms of rotating devices have been employed. These rotating looptaking devices are more or less diiilcult of adjustment when it is desired to vary the distance between the two scams or rows of stitches, and it is, moreover, impracticable to construct a post-machine which will form more than twoindependent seams at onetime when rotating loop-taking devices are used; but by employing a horizontal rocleshaft located at the upper part of the hollow work-supporting post and by which rock-shaft the loopers or loop-taking devices are carried it will be ap parent that in adjusting the said loopers or loop-taking devices to vary the distance between the seams they may be readily moved longitudinally of said shaft, (to which they will preferably be attached by set-screws,) so that the adjustment may be easily and quickly effected. Moreover, this horizontal looper-carryin g rock-shaft, placed transverse to the plane of the. feed of the work, permits of the employment in a post-machine of any desired number of oscillating or rockingloopers or loop-taking devices moving back and forth in the plane of the feed of the work, so that my improved post-machine is capable of sewing three or more seams simultaneously, instead of being limited merely to two seams, as are the post machines heretofore constructed and employing rotating loop-taking devices.

Having thus described my invention, 1 claim and desire to secure by Letters Patent- 1.' In a sewing-machine, the combination with the framework thereof comprising a hollow standard, an overhanging arm and a bedplate provided at its forward end with a vertical, hollow, work-supporting post, of a rocker located at the upper part of said post and provided with one or more double chain-stitch loopers, operative mechanism for said rocker, a take-up device for the looper thread or threads located at or near the base of said post and near the forward end of the said bedplate, operating mechanism for said take-up device and connections between the latterand said loopers.

2. In a sewing-machine, the combination with a feeding mechanism comprising a feedoperating rock-shaft from which horizontal movements are imparted to the feed-bar, of a double chain-stitch looper, a rocleshaft from which movements are imparted to said looper, a take-up arm moving with said shaft and two takeu p eyes between which said take-up arm operates, said eyes being carried by a movable part which isoperated from said feed-operating rock-shaft so that the movements of said take-up eyes will be varied in accordance with the length of the feed, said eyes having a greater movement when the feed is longer and a lesser movement when the feed is shorter.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT RONTKE.

\Vitnesses: i

HENRY CALVER, PHILIP DIEHL. 

